Dear Federic@,
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Here in the north of England, if we say: "I �m going to X �s", (using an apostrophe �), it refers to going to a house, a building, a place, which is well-known to both the Speaker and the Listener.
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"Let �s go to Maria �s" ( = "Let us go to the house of our mutual friend, Maria").
"Let �s go to Dad �s" ( = "Let us go to the house of our father").
"Let �s go to Robert �s" ( = "Let us go to the house of our brother, Robert, who we have recently been discussing").�
"Let �s go to the Doctor �s"�( = "Let us go to the surgery of the Doctor, and we both know which Doctor I mean").
"Let �s go to the Chemist �s" ( = "Let us go to the Pharmacy of the Chemist which I always use").
"Let �s go to the Newsagent �s" ( = "Let us go to the Shop of the Newsagent where I/we always buy our newspaper, or the Newsagent �s shop that we have recently been discussing").
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Using this analogy:
"Let �s go to the Teacher �s" ( = "Let us go to the house/residence/classroom/private room/study of the Teacher who we all know and who we visit regularly").
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This may be what is intended in the script.�
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Les Douglas�